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GCN Circular 11837

GRB 110328A / Swift J164449.3+573451: optical observations
2011-03-30T01:45:38Z (13 years ago)
Alexei Pozanenko at IKI, Moscow <>
A. Volnova (SAI MSU), A. Pozanenko (IKI), E. Klunko (ISTP) on behalf of 
larger GRB follow up collaboration report:

We observed the field of GRB 110328A / Swift J164449.3+573451 (Cummings et 
al. GCN 11823) with AZT-33IK telescope of Sayan observatory (Mondy) starting 
on March 28 (UT) 13:46:35, i.e. 6 minutes after second trigger (Barthelmy et 
al. GCNC 11824).
We identified the optical counterpart (Cenko et al. GCN 11827, Leloudas et 
al. GCN 11830) in the combined image of a total exposure of 67 min. The 
photometry of the optical counterpart in the combined image is R=21.50 +/- 
0.10 and based on the USNO-A2.0 star 1425-08596694 assuming R=16.6. The 
photometry is still preliminary and calibration of  field stars is necessary 
(Cenko et al. GCN 11827) to confirm the variable nature of the optical 

[GCN OPS NOTE(30apr11): Per author's request, Elunko was changed to Klunko.]
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